Process of and apparatus for producing stereoscopic motion pictures



Feb. 13, 1934. C. F, MNDEZ 1,947,161

PROCESS OF ANDy APPARATUS FOR PRODUCING STEREOSCOPIC MOTION PICTURES VOrig`inal Filed July 8, 1930 FIG. 5-

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vPatented Feb. 13,

PROCESS F AND APPARATUS FOB PRO- DUCIG STEREOSCOPIC MOTION PIC- Ciro Fidel Mndez, New York, N. Y. Reiiled for abandoned application Serial No.

July 8, 1930. This application April 13,

1933. Serial No. 606,050

3 Claims. (Cl. 8810.0)

My invention consists in a new and useful improvement in the process of and apparatus for producing stereoscopic motion pictures. The particular advantage of my invention is the 5 projection upon a screen of moving pictures in which objects appear in three dimensions to the observer by his natural vision, without the aid of `any colored screens as used in former processes.

The process which I have invented to make possible such projection is as follows:

Two moving picture cameras are so related as 4 to produce stereoscopic pictures of the desired scene. and by these I produce simultaneously two tllms. I thus secure right and left perspective views. Then, by the well-known process, I produce a single illm A, on which the two perspective views are superposed, the rightperspectivel being printed in greenish-blue and the leitfperspective being printed in vorange-red. I 'tnen produce a second film4 B, on which-the perspective views are superposed, the right perspective being printed in orange-red and the left perspective being printed in greenish-blue.

'Ihus far, my process is that practiced toproduce a lm which when viewed through the opr colored screens produces a stereoscopic The next step in my improved process is to produce a single illm C, formed by alternating the successive exposures of the illms A and B. Thus I produce a nlm in which the same perspective view of each exposure is duplicated in complementary colored prints. I have, therefore, on the nlm C four images for each exposure, arranged in two pairs.

ItistobeunderstoodthatmylmCismoved by the projector at a speed twice that of the usual form of motion picture film so -that each pair of double images is presented to the observer in the same time interval that a single image is presented in the usual form of projection. The effect of this projection of my improved illm C is that the complementary colors produce the stereoscopic view, by the operation oi the well-known law of optics.

In the drawing filed herewith, I have illustrated my improved lms by which my improved process may be practiced, but it is to be distinctly understood that I do not consider my invention limited to said illustration but reier for its scope to the claims appended. hereto.

In the'drawlng:

Fig. 1 is a portion oi' thepreliminary iilm A.

Fig. 2 is a portion of the preliminary. nlm B.

the film B, the images 3 of each exposure are printed in greenish-blue and the images 4 oi each exposure are printed in orange-red.

The completed nlm C is produced by alternating the exposures of the films A and B. As illustrated in' the drawing (Fig. 3) the film C is composed of exposures A1, B1, A, B3, etc. Thus it is obvious that when the film C is projected as described, the exposure A1 presents the image 'id the image 2 to the eyes of the observer, the

l ression of which is retained by the retinas of eyes until the exposure Bl presents the images 3 and 4, when the physical phenomenon occurs as follows: The apparently superposed images l and 3 being printed in complementary colors present a black and white image precisely corresponding with the left perspective view recorded by one of the cameras, and the apparently superposedimages 2 and 4 being printed in complementary colors present a black and white image precisely corresponding with the right perspective view recorded by the other camera. These two perspective views, being presented simultaneously, produce the stereoscopic eect, so that the objects appear in three dimensions. The eil'ect of my process is to supply motion pictures with the appearance of depth.

Having described my invention, what I claim is: v

1. The process of producing stereoscopic motion pictures which consists in producing simultaneously two stereoscopic images, each image being in a color complementary to the color of the other image; and then producing simultaneously two stereoscopic images identical in form with said rst two images and in reversely complementary colors to the colors of the said viirst two images, and repeating the above described stepsfior successive duplicate pairs ci images delineating the moving object.

2. 'I'he process of producing stereoscopic motion pictures which consists in producing simultaneously two stereoscopic motion picture iilms, one consisting of right perspective images, and the other consisting of left perspective images, producing a preliminary nlm composed of superposed right and lett perspective images, thetwo sets being printed in complementary colors, producing a second preliminary lm composed of superposed right and left perspective images, the two sets being printed in reversely complementary colors to the colors of the two sets of images in the rst preliminary film, and producing a completed lm by alternating the pairs of perspective images from the two preliminary films,- and projecting the completed iilm at a 

